Helen B. Sawyer A Bibliography of Individual Globular Clusters

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386 Publications of the David Dunlap Observatory Royal Canadian Institute, and the Meteorological Service of Canada. About fifty more papers were obtained from other Canadian libraries, those of the Dominion Observatory, Ottawa, McGill University, and the University of Alberta. Fifty others were borrowed from United States libraries, chiefly from the Harvard Observatory and the University of Michigan. I am indebted to librarians Miss Slater and Miss Wales of the University of Toronto, Miss Hanley of the Harvard Observatory, and Mr. Gauthier of the Dominion Observatory for aid in obtaining some of the references. I am especially indebted to Miss Edna Fuller, Miss Ruth Northcott and my husband, Dr. F. S. Hogg, all of the David Dunlap Observatory, for assistance at various stages of the work; to Mrs. R. E. Williamson for preparation of the final manuscript for the printer; and above all to Dr. Harlow Shapley for his inspira- tion for my two decades of work on star clusters. I began this work with the realization that it was beyond the limits of human frailty to make it one hundred per cent complete and correct. I have striven to make the bibliography as correct and complete as circumstances would permit, and will welcome any corrections or additions of important papers which may be included in later lists. II. A Catalogue of Globular Star Clusters For the convenience of the reader, certain of the material indi- cated in the bibliography has been assimilated into a table of information on globular clusters. Table I lists all clusters at present on the globular list for our own galaxy. The clusters are arranged by XGC number, which does not always correspond to right ascension for 1950. Successive columns give the NGC number, the right ascension and declination for 1950, and the constellation in which the cluster is located as determined from the I.A.U. Atlas. The galactic longitude and latitude the basis of the Harvard Pole have been computed for 1900 on 12 h 40 m , + 28°, with the help of Ohlsson's tables, Lund Annals, no. 3, 1932. The concentration class for most clusters is that assigned by Shapley and Sawyer in 1927. The angular diameters are partly by Mowbray. 194G. and partly by Shapley and Saver, 1935. The integrated photographic magnitude is, when possible, by Christie, 1940; or by Sawyer and Shapley, 1927, reduced to the same system. The spectral type and radial velocity in
A Bibliography of Globular Clusters 387 kilometres a second are by Mayall, 1946; the number of variables according to Sawyer, 1939, with some more recent adjustments. The magnitudes of bright stars and variables are from the most recent reliable published observations to be found under each cluster. The color excess is by Stebbins and Whitford, 1936. The modulus from variables in the next to the last column of the table is uncorrected for absorption, and the reader may apply the correction which seems to him best to fit the case. Many of the blanks in the table will be filled during the coming months from studies of the David Dunlap plates. (a) It is interesting to note from this catalogue the distribution of globular clusters by constellation. The 99 globular clusters are found in only 37 of the constellations. Somewhat surprisingly, the largest number of globular clusters is found in the constellation of Ophiuchus, which has 20. The second largest total, 17, is as one would expect, in Sagittarius; Scorpio is third with 8. Xo other constellation has more than 3. Six constellations have 3 each, 7 have 2, and 22 have one. The distribution by constellation is as follows: Ophiuchus 20, Sagittarius 17, Scorpio 8, 3 each in Coma Berenices, Lupus, Hercules, Ara, Pavo, and Aquarius; 2 each in Toucan, Musca, Hydra, Centaurus, Apus, Serpens, Delphinus; one cluster each in Sculptor, Horologium, Mensa,Columba,Lepus,Puppis,Lynx, Carina, Vela, Canes Venatici, Bootes, Virgo, Libra, Norma, Corona Austrina, Telescopium, Scutum, Aquila, Lyra, Sagitta, Pegasus, Capricornus. The heaviest concentration of known globular clusters is definitely in the region of Ophiuchus-Sagittarius, rather than in the more commonly mentioned one of Sagittarius-Scorpio. (b) A feature of the main section of the bibliography is that for each cluster I have tried to indicate the date of the first recorded observation. This is the first observation of the object in the sky; I have not attempted to indicate when the object was first correct ly assigned to the globular category. Even at the present day the proper classification of some objects is still doubtful. It is interesting then to note the astronomers who first observed these objects in the sky. The man who leads all others in the discovery of globular clusters is Sir William Herschel, who found exactly one-third of the clusters accepted as globular today.
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Helen B. Sawyer A Bibliography of Individual Globular Clusters

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